Adjustable rear sight for a firearm



FIG. 1 is a perspective view of the adjustable rear sight for a firearm, showing my new design, with the adjustable sighting element being shown in its lowest possible position;

FIG. 2 is a left side elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a right side elevational view thereof;

FIG. 6 is a front elevational view thereof;

FIG. 7 is a bottom plan view thereof;

FIG. 8 is a rear elevational view, showing the adjustable sighting element in its highest possible position; and,

FIG. 9 is a perspective view of the adjustable rear sight for a firearm, showing the adjustable sighting element in its highest possible position. 

The ornamental design for an adjustable rear sight for a firearm, as shown and described. 